Jack for bu



(No Model.) G JAG K FOR BURNISHING MACHINES.

Patented May 16, 1893.

1 r y: f i f1 1 v .l r) m ESSEE.

Wii

Tu: mums P212035 00.. moTo-u'ma wnsums'mu n c inn TATE-7S1 PATENT OFFICE.

JACK FOR BUBNISHING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 497,505, dated May 16, 1893. Application filed November 23,1892. Serial No. 52,906. (No model.)

To all whom it may concern;

Be it known that I, GEORGE SUMNER, a citizen of the United States, residing at Brain-' tree, in the county of Norfolk and Commonwealth of Massachusetts, have invented a new and useful Improvement in Burnishing-Jacks,

standard, with devices for adjusting the two portions of the last for varying sizes and adjusting the standards to different heights as will be more particularly described and claimed.

In the drawings, Figure 1 is a side elevation of a burnishing-jack and standard embody- 1ng my invention. partly in section showing the last extended.

The fore-part piece a has a spindle a which fits in a socket in the standard A andvwhich The heel andis clamped by set-screw a shank piece b has a spindle b which fits in a socket in standard B and which is clamped by set-screw b The standards are slotted at a and b respectively, forming guides for the pins 0 b to prevent the last from turning. The standard A which carries the fore-part last is fixed to the bracket base 0, and the standard Bis pivoted to the bracket at O. This bracket is supported on a spindle D which enters a socket in the column E.

The toggle-jointed levers ff pivoted to the standards A B are operated by treadle G.

through treadle-rod g, arm 71. and rod Z. When the treadle is depressed the toggle-arms throw back the standard B on its pivot and cause the heel and shank piece to slide back and lengthen the last as shown in Fig. 2. I prefer to make theheel and shank portion in one piece as shown and the toe-piece as shown so that there will be an ofiset on the toe-piece on which the shank will slide when the last is extended. I also prefer to make both portions of the last detachable from the standards by means of the spindles as shown, so

Fig. 2 is a side elevation- The last may however be divided leaving sirnply'the heel portion on one part, I

and the shank and fore-part on the other; In such case the same heel portion could be used for all sizes and might if desired be made fixed to its standard instead of detachable, but the fore-part should still be detachable and exchangeable. A ratchet N engages with the treadle to hold it at the desired point of extension. When the treadle is released from the ratchet the spring P assists the return movement ofYthe standard B.

The machine is adjustable to different heights by moving the spindle D in the socket, the spindle being clamped by setscrew cl. The rod Zis made in two parts whose inner ends are screwed into a coupler Z one being right handed and the other left handed, by which the rod Z may be shortened or lengthened to correspond with the position of the spindle D.

What I claim as my invention is-' 1. In a jack, 2. fixed standard and a pivoted standard, a two-part last, the heel piece being mounted upon one standard, and the toe-piece having a spindle by which it is detachably mounted in a socket in the other standard, a treadle and connecting-rods and toggle-levers by which the pivoted standard may be opened away from the fixed standard thereby extending the two-part last, a ratchet to retain the pivoted standard in its adjusted position, and a spring to return the pivoted standard when the ratchet is released, substantially as described.

2. In a jack, a fixed standard and apivoted standard, a two part last, the toe piece having a spindle by which it is detachably mounted in a socket in the fixed standard, the heel piece having a spindle by which it is detachably mounted in a socket in the pivoted standard, a treadle and connecting rods and toggle levers by which the pivoted standard may be opened away from the fixed standard thereby extending the two part last, the two parts of the last being made with an offset so that the movable piece will slide on the fixed piece, a ratchet to retain the pivoted standard at any r position, and a spring to return the pivoted standard when the ratchet is released, substantially as described.

3. In a jack, a fixed standard and a pivoted standard, a two part last, one part mounted upon each standard, a spindled bracket base upon which the two standards are mounted in common, a column with socket to receive the bracket spindle and a clamping device to hold the bracket at different elevations above the column, a treadle and connecting rods and levers for opening the pivoted standard, one of the connecting rods being made extensible to correspond with the elevation of the bracket base, a ratchet to retain the pivoted standard at any degree of opening and GEORGE SUMNER.

Witnesses:

N. THAYER WILDE, E. M. SUMNER. 

